Small-q phonon-mediated unconventional superconductivity in the iron pnictides

被引：23
作者：
Aperis, A. [1 ]
Kotetes, P. [1 ,2 ]
Varelogiannis, G. [1 ]
Oppeneer, P. M. [3 ]
机构：
[1] Natl Tech Univ Athens, Dept Phys, GR-15780 Athens, Greece
[2] Karlsruhe Inst Technol, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany
[3] Uppsala Univ, Dept Phys & Mat Sci, S-75121 Uppsala, Sweden
来源：
PHYSICAL REVIEW B | 2011年 / 83卷 / 09期
基金：
瑞典研究理事会;
关键词：
TEMPERATURE; DEPENDENCE; YBA2CU3O7; GAP;
D O I：
10.1103/PhysRevB.83.092505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report self-consistent calculations of the gap symmetry for iron-based high-temperature superconductors using realistic small-q phonon-mediated pairing potentials and four-band energy dispersions. When both electron and hole Fermi surface pockets are present, we obtain the nodeless s(+/-) state that was first encountered in a spin-fluctuation mechanism picture. Nodal s(+/-) as well as other gap structures such as d(x2-y2), s(+/-) + d(x2-y2), and even a p-wave triplet state, are accessible upon doping within our phononic mechanism. Our results resolve the conflict between phase-sensitive experiments reporting a gap changing sign, attributed previously only to a nonphononic mechanism, and isotope effect measurements proving the involvement of phonons in the pairing.
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页数：4
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